Databases and Information Systems Balticdb&IS'2012

Databases and Information Systems BalticDB&IS‘2012 Lithuanian Academy of Sciences Vilnius University Lithuanian Computer Society Databases and Information Systems Tenth International Baltic Conference on Databases and Information Systems Local Proceedings, Materials of Doctoral Consortium Vilnius, Lithuania July 8-11, 2012 Edited by Albertas Čaplinskas Vilnius University Lithuania Gintautas Dzemyda Vilnius University Lithuania Audronė Lupeikienė Vilnius University Lithuania Olegas Vasilecas Vilnius Gediminas Technical University Lithuania Vilnius 2012 UDK 004.65(474.5)(06) Da372 Databases and Information Systems. Tenth International Baltic Confe- rence on Databases and Information Systems. Local Proceedings, Materials of Doctoral Consortium. A. Čaplinskas, G. Dzemyda, A. Lupei- kienė, O. Vasilecas (Eds.). Vilnius: Žara, 2012, 264 p. This book consists of three independent parts. The first part contains the short communications and accepted full research papers presented at the 10th Jubilee International Baltic Conference on Databases and Information Systems (BalticDB&IS’2012) but not included in the post-proceedings published by IOS Press Frontiers in Artificial Intelligence and Applications series. The second part contains the abstracts of the papers published in post-proceedings. Finally, the third part contains the materials of Doctoral Consortium. Short communications and full research papers discuss the wide spectrum of research topics including databases, data mining and optimisation in information systems, business modelling, cloud computing and e-service, software evaluation and testing, decision support systems, norms and reasoning, information system engineering tools and techniques, and advanced e-learning environments and technologies. In the materials of Doctoral Consortium doctoral students present the current state of their research. Cover design: A. Gedgaudas Typesetting: manuscripts were formatted by conference technical staff ISBN 978-9986-34-274-8 © The authors named in the author index, 2012 ORGANISED BY Lithuanian Academy of Sciences Vilnius University, Institute of Mathematics and Informatics Lithuanian Computer Society SPONSORS Research Council of Lithuania Algoritmų Sistemos, Ltd. Information Technologies Institute vii Conference Committee Steering Committee Juris BORZOVS, University of Latvia, Latvia Janis BUBENKO, Stockholm University, Sweden Albertas ČAPLINSKAS, Vilnius University, Lithuania Jānis Grundspeņķis, Riga Technical University, Latvia Hele-Mai HAAV, University of Technology, Estonia Ahto KALJA, Tallinn University of Technology, Estonia Mārīte KIRIKOVA, Riga Technical University, Latvia Audronė LUPEIKIENĖ, Vilnius University, Lithuania Arne SØLVBERG, Norwegian University of Science and Technology, Norway Olegas VASILECAS, Vilnius Gediminas Technical University, Lithuania General Chair Gintautas DZEMYDA, Vilnius University, Lithuania Program Committee Co-Chairs Albertas ČAPLINSKAS, Vilnius University, Lithuania Olegas VASILECAS, Vilnius Gediminas Technical University, Lithuania Publishing Co-Chair Audronė LUPEIKIENĖ, Vilnius University, Lithuania Programme Committee Irina ASTROVA, Tallinn University of Technology, Estonia Marko BAJEC, University of Ljubljana, Slovenia Romas BARONAS, Vilnius University, Lithuania Guntis BĀRZDIŅŠ, University of Latvia, Latvia András BENCZÚR, Eötvös Loránd University, Hungary Jānis BIČEVSKIS, University of Latvia, Latvia Mária BIELIKOVÁ, Slovak University of Technology in Bratislava, Slovakia Juris BORZOVS, University of Latvia, Latvia Boštjan BRUMEN, University of Maribor, Slovenia Dumitru Dan BURDESCU, University of Craiova, Romania Rimantas BUTLERIS, Kaunas University of Technology, Lithuania Vytautas ČYRAS, Vilnius University, Lithuania Paweł CZARNUl, Gdansk University of Technology, Poland Valentina DAGIENĖ, Vilnius University, Lithuania Marlon DUMAS, University of Tartu, Estonia Dalė DZEMYDIENĖ, Mykolas Romeris University, Lithuania viii Jutta ECKSTEIN, IT communication, Germany Johann EDER, University of Vienna, Austria Jānis GRUNDSPEŅĶIS, Riga Technical University, Latvia Saulius GUDAS, Kaunas University of Technology, Lithuania Remigijus GUSTAS, Karlstad University, Sweden Hele-Mai HAAV, University of Technology, Estonia Zbigniew HUZAR, Wroclaw University of Technology, Poland Sylvia ILIEVA, Sofia University St. Kliment Ohridski, Bulgaria Mirjana IVANOVIĆ, University of Novi Sad, Serbia Leonid KALINICHENKO, Institute of Informatics Problems of the Russian Academy of Science, Russia Ahto KALJA, Tallinn University of Technology, Estonia Audris KALNIŅŠ, University of Latvia, Latvia Mārīte KIRIKOVA, Riga Technical University, Latvia Peep KÜNGAS, University of Tartu, Estonia Olga KURASOVA, Vilnius University, Lithuania Sergei KUZNETSOV, Institute for System Programming of the Russian Academy of Sciences, Russia Marion LEPMETS, Public Research Centre Henri Tudor, Luxembourg Audronė LUPEIKIENĖ, Vilnius University, Lithuania Rainer MANTHEY, University of Bonn, Germany Dorina MARGHESCU, Åbo Akademi University, Finland Saulius MASKELIŪNAS, Vilnius University, Lithuania Mihhail MATSKIN, KTH Royal Institute of Technology, Sweden Raimundas MATULEVIČIUS, University of Tartu, Estonia Jürgen MÜNCH, University of Helsinki, Finland Lina NEMURAITĖ, Kaunas University of Technology, Lithuania Boris NOVIKOV, St-Petersburg University, Russia Algirdas PAKŠTAS, London Metropolitan University, UK Jaan PENJAM, Tallinn University of Technology, Estonia Dana PETCU, West University of Timisoara, Romania Ivan I. PILETSKI, Belarusian State University of Informatics and Radioelectronics, Belarus Jaroslav POKORNÝ, Charles University in Prague, Czech Republic Henrikas PRANEVIČIUS, Kaunas University of Technology, Lithuania Boris RACHEV, Technical University of Varna, Bulgaria Jolita RALYTĖ, University of Geneva, Switzerland Rok RUPNIK, University of Ljubljana, Slovenia Gunter SAAKE, Otto von Guericke University of Magdeburg, Germany Simonas ŠALTENIS, Aalborg University, Denmark Kurt SANDKUHL, University of Rostock, Germany Michał ŚMIAŁEK, Warsaw University of Technology, Poland Darijus STRAŠUNSKAS, Norwegian University of Science and Technology, Norway Uldis SUKOVSKIS, Riga Technical University, Latvia Rimantas VAICEKAUSKAS, Vilnius University, Lithuania Damjan VAVPOTIČ, University of Ljubljana, Slovenia Irina VIRBITSKAITE, A.P. Ershov Institute of Informatics Systems, Russia Robert WREMBEL, Poznań University of Technology, Poland Janusz ZALEWSKI, Florida Gulf Coast University, USA ix Additional Reviewers Natalia GARANINA, Russia Tarmo ROBAL, Estonia Nada BAJNAID, Saudi Arabia Riina MAIGRE, Estonia Arne KOSCHEL, Germany Ateeq KHAN, Germany Kristina SMILGYTĖ, Lithuania Norbert SIEGMUND, Germany Lovro ŠUBELJ, Slovenia Azeem LODHI, Germany Milos RADOVANOVIC, Serbia Iwona DUBIELEWICZ, Poland Tomaž HOVELJA, Slovenia Lech TUZINKIEWICZ, Poland Simon VRHOVEC, Slovenia Bogumiła HNATKOWSKA, Poland Doctoral Consortium Advising Committee Coordinator Prof. Dalė DZEMYDIENĖ, Mykolas Romeris University, Vilnius University Institute of Mathematics and Informatics, Lithuania Advisors: Prof. Jānis GRUNDSPEŅĶIS, Riga Technical University, Latvia Prof. Hele-Mai HAAV, University of Technology, Estonia Prof. Mārīte KIRIKOVA, Riga Technical University, Latvia Prof. Henrikas PRANEVIČIUS, Kaunas University of Technology, Lithuania Coordinators of Special Sections Olga KURASOVA, Vilnius University (Section: Data Mining and Optimisation in IS) Valentina DAGIENĖ, Vilnius University (Section: Advanced e-Learning Environments and Technologies) Local Organising Committee Chair Saulius MASKELIŪNAS, Lithuanian Computer Society Local Organising Committee Bronius JASKELEVIČIUS, Litnuanian Academy of Sciences Viktor MEDVEDEV, Vilnius University Jolanta MILIAUSKAITĖ, Vilnius University Laima PALIULIONIENĖ, Vilnius University Sandra SVANIDZAITĖ, Vilnius University Marius ŠAUČIŪNAS, Vilnius University Dalia ŠUKVIETIENĖ, Lithuanian Computer Society Aidas ŽANDARIS, Lithuanian Computer Society xi Preface The series of Baltic DB&IS biennial conferences was started in 1994. The first conference was held in Trakai, Lithuania. It was initiated by Prof. Janis A. Bubenko Jr. (Royal Institute of Technology, Stockholm, Sweden) and Prof. Arne Sølvberg (Norwegian University of Science and Technology, Norway) and organised by Institute of Mathematics and Informatics (Lithuania), Vilnius University (Lithuania), Vilnius Technical University (Lithuania). This time was a hard time for Baltic research community. After the crash of Soviet Union the cooperation with the research centres in Moscow, Leningrad, Kiev, and Novosibirsk was broken. The horizontal cooperation between research centres in Lithuania, Latvia and Estonia was weak developed. We had almost no touch with the research centres in West countries and even in East European countries. The idea of Janis A. Bubenko jr. and Arne Sølvberg to organise Baltic Workshops on databases and information systems was indeed a great idea. It helped to consolidate research communities in Baltic countries, to establish contacts with research centres in West and East European countries, and even to renew contacts with the researchers in Russia. These workshops have become a real incentive for development of regional research and boost of international cooperation. Janis A. Bubenko jr. and Arne Sølvberg helped also to receive founding and even trained us in West European conference organization technologies. Despite the fact that Tallinn, Riga and Vilnius had big experience in organizing large

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